In today’s Gospel (Mt 1: 18-25), Joseph is unwilling to expose Mary to shame and therefore decides to divorce her quietly.
Since Joseph was already Mary’s husband (v19), what is the source of the shame?
Common explanation is that she was pregnant and unwed (only betrothed v18), but v19 seems to indicate otherwise.
Why the need for the divorce? Joseph could have simply remained silent, remained with Mary and there would be no shame at all since they were married.